Manufacturing artificial threads, films, and the like.



Unrrnn Serums-PAT NT OFFICEQ ERNST WILLY FRIEDRICH, or BLiroN, BE GIUM.-

MANUFAGTURRNG AR'riF oiAi. THR ADS. FiLmsQAND THE LIKE-1 In wi l whom/zit may concern Be it known that 1, Elmer WILLY FRIED- men, a subject of the German Emperor, and

for the manufacture of artificial threads, trims, or the like, in WillCll the proportion of ammonia used for making the necessary solotion of cellulose or the like may be essentially less than that which has hitherto generally been required.

By the procedure which has hitherto been usual in making suchsolutionsit was necessary, in order to avoid premature coagula tion, to use a certain proportion of ammonia in excess, so that the solution. might have the required content of cellulose. .lt is true that alter neutralization this excess of ammonia could be recovered, but of course during the operations for effecting this there was an unavoidable loss, and, moreover, the neutralize ing agent was sacrificed. it was not possible iirst to prepare a concentrated solution of cellulose, which of itself alone resents technical oifliculties, and then to di ute this solution by adding Water until itconlaincd the desired proportion of cellulose, because in doing so the cellulose was very easily separated from the solution. The attempt has been made to separate a part of the ammonia from the solution-for instance, by using a vacuum. This, however, is a tedious operation. and may easily entail. a loss of part of the ammonia. 7

By the present invention a solution con taining the same proportion of cellulose as such solutions have hitherto generally contamed may be prepared, notwithstanding that an essentially smaller proportion of ammonia is used-for example, only halfin making the solution. For this purpose instead of preparing the whole solution at once there first prepared asolution of a portion of the cellulose to be dissolved in an ammoniacal solution containing the usualproportion of ammonia for that quantity of cellulose. To the solution thus produced there is then added the rest of the cellulose in separate portions, to ether with further portions of ammoniafinu liich )OI'lllOllS the concentration of the ammonia decreases.

specification of Letters Patent ApplioationfiledDecember 10, 1906. Serial No. 347,029.

Patented April 18, 1907.

methods hitherto usual, as much as one liter of the ord nary ammoniacal liquid had to be used for everyfiity grams of cellulose.

centimeters of'the same ammoniacal liquid, and the bulk may be made u with water.-

The following example ill dstrates the invention: Basic copper sulfate is precipitated upon fifty grams of h drated cellulosejby mixing hydrated cellu ose copper sulfate,

and caustic potash in the proportions represented by the formula:

36 E 6 491150 SE 0 (SKOH.

The cellulose thus prepared is divided into four equal portions. solved in two hundred and fifty cubic centimeters of ammonia solution of specific gravity 18 to 20 Baumn To the solution thus obtained the other three portions are added little by little, and at thesametime there is.

added in all two hundred and fifty cubic centimeters of the same solution of ammonia distributed between the separate portions of cellulose, the portion oi ammonia solution added being more strongly diluted with Wator for each successive and the total quantity 0 water added being suliicient to bring the total volume of the liquid to one liter. It is necessary to observe that the proportion of Waterto solution of ammonia in the last portion added should he 1 :1 to 1: 53, because if a more dilute-solution of ammonia were used coagulation might en sue. The solution thus obtained is filtered, for which purpose a metal gauze having one hundred and sixty to one hundred and eight meshes to the centimeter will suffice. The iltered solution is viscous, permanent, andspins well and can be made into artificial threads, films, or the like in the usual manner.

The proceeding is analogous in starting from one of the other materials serving to produce similar products-for instance, when the raw material is a cellulose of different properties, silk, or the like. The metallic compound used may be introduced in any known manner equa y as Well as m that described.

What I claim is- 1. The herein-described process of manu- Of these one is disortion of cellulose In order to obtain a solution containing I five per cent. of cellulose according to the 69 Ac cording; to the present invention, however, the same quantity of cellulose can be brou ht into solution With aid of five hundred cu bic,

ICC

facturing artificial glossy products from fibrous substances soluble in ammoniacal solutions of metallic compounds, by first pre paring a solution from a part of the'substance that is to be dissolved, in presence of such metallic compound, in a solution of ammonia containing the proportion of ammonia 4 usual for that quantity of said substance, and

then adding to the solution thus obtained the. rest of said substance in several portions together with correspondirng quantities oi me-- tallic compound and at the same time further portions of ammonia in solutions of successively-din'iinishing strength, avoiding however precipitating the dissolved substance by an undue excess of Water, and finally converting the solution into glossy products by giving the material a convenient form and coagulating the so-called products, substantially as described.

- 2. The herein-described rocess oi" manufacturing. artificial threads roin' fibrous substances soluble in ammoniacal solutions of i metallic compounds, by first preparing asolution from a part of the substance that is to be (l1SSOlVd,- in presence of such metallic ,compound, in a solution of ammonia contaimng the proportion of ammonia usual for that quantity of said substance, and then adding to the'solution thus obtained the rest of saidsubstance in several portions together with corresponding quantities of metallic compound and-at the same time further portions of ammonia in solutlons of success1vely diminishing, strength, avoiding however pre cipitating thedissolved substance by an. un due excess of Water, and finally converting the solution into threads by spinning the solution iii/any convenient manner and coagulating the s0forn1ed threads, substantially as described.

3. The herein-described process of manufacturing artificialthreads from cellulose, by first preparing a solution from a part of the by an undue excess of water, and finally converting the solution into threads by spinning the solution 111 any convenient manner 'and coagulating the so-formed threads, substantially as described,

4. The herein-described process of manufacturing artificial threads from cellulose, by first preparing a solution from a part of the cellulose that is to be dissolved, in presence of a copper compound the amm'oniacal solution of which is capable of dissolving cellulose, in a solution of ammonia containing the proportion of ammonia usual for that quan-.

tity of cellulose, and then adding to the solution thus obtained the rest of the cellulose in several portions together with corresponding quantities of copper compound and at the same time further portions of ammonia in so- .lutlons of suecess1vely-d1mm1sh1ng strength,

avoiding however precipitating the cellulose by an undue excess of water, and finally eon:

'verting the solution into threads by spinning" the solution in any convenient manner and coagulating the so-lormed threads, substantially as described. c

In testimony that liclaim the foregoing as my invention I have signed my name in presenceof two subscribing Witnesses. I ERNST NILLY FRIEDRICH. Witnesses: i

GREGORY PH-ELAN, PAUL ltl geaYlf 

